﻿<blockquote class="extDef">NOTE&nbsp; Definition according to ISO/CD 10303-42:1992<br>
This function returns normalized orthogonal directions, u[1], u[2] and, if
appropriate, u[3]. In the three-dimensional case, with complete input
data, u[3] is in the direction of axis3, u[1] is in the direction of
the projection of axis1 onto the plane normal to u[3], andu[2] is
orthogonal to both u[1] and u[3], taking the same sense as axis2. In
the two-dimensional case u[1] is in the direction of axis1 and u[2] is
perpendicular to this, taking its sense from axis2. For incomplete
input data appropriate default values are derived.</blockquote>

<blockquote class="note">NOTE&nbsp; Function adapted from <strong>base_axis</strong> defined in ISO 10303-42.</blockquote>

<blockquote class="history">HISTORY&nbsp; New function in IFC2x</blockquote>